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Limits for carbohydrate impurities in Lactulose formulations according to monographs in the European Pharmacopoeia
| Lactulose crystals | Lactulose liquid1 | |
| Epilactose | ≤ 0.5% | ≤ 10.0% |
| Galactose | ≤ 0.5% | ≤ 15.0% |
| Lactose | ≤ 3.0% | ≤ 10.0% |
| Fructose | ≤ 0.5% | ≤ 1.0% |
| Tagatose | ≤ 0.5% | ≤ 4.0% |
| 3-Deoxy-D-glyceropentulose | - | ≤ 4.0% |
| Total impurities | ≤ 3.0% | ≤ 12.0% (excluding galactose and lactose) |
Values relative to lactulose.
